JPS5846306Y2 - Lubricating device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a lubricating device.

As is well known, agricultural tractors, etc., have a hydraulic system, and the cylinders in this system operate the work equipment or other auxiliary equipment in a predetermined manner.For example, in a tractor, a tilling rotary is raised and lowered at the rear of the machine. A hydraulic system is mounted on the system to allow the lift arm to move along with the hydraulic cylinder in the system. Since it is pivotally connected in a state where it receives a transmission force, it is necessary to lubricate this part intensively.

The conventional countermeasure in this case is to use the return oil of the hydraulic cylinder to inject this oil into the relevant lock point, for example, by injecting the nozzle into the control pulp for the hydraulic cylinder. In this method, a pipe with a diameter is protruded, and the tip of this pipe is placed facing the area to be lubricated.In this case, the pipe is generally completely fixed to a control valve, etc., so the flow rate is limited. Therefore, the piston, which returns to its original position due to the weight of the rotary tiller, sometimes exhibits excessive pressure due to the vibrations of the rotor and tarry, and if this returned oil is introduced into the fixed pipe, the inside of the pipe cannot respond to this excessive pressure. Because the back pressure has a repulsive effect inside the cylinder, the rotary cannot fall smoothly, which also causes various problems such as oil leakage due to the back pressure. Although it is conceivable to leave the oil injector at normal pressure, this method does not allow for proper oil injection at normal pressure, and the current situation is that it is too late to solve these problems.

This idea was devised to solve the above problem, and its purpose is to discharge the excess oil midway when the amount of returned oil is above the fixed yield, thereby creating back pressure in the hydraulic system. The purpose of the present invention is to provide a lubricating device that is capable of constant and smooth operation without causing too much lubrication and is characterized by the fact that the oil guide pipe is placed on the fixed side so as to face the desired lubrication point. In a lubricating device that is installed and uses its oil guide pipe to supply discharged oil from a hydraulic cylinder to a desired lubrication point for lubrication, slide the inlet cylinder of the oil guide pipe into the outlet of the discharged oil in the insertion/removal direction. The introduction cylinder part is attached to the fixed side so that the introduction cylinder part slides in the removal direction when the discharged oil increases, and excess oil is discharged from between the introduction cylinder part and the outlet. The main feature is that a spring is provided to maintain elasticity.

The specific examples shown in the drawings will be described below.

Figures 1 to 4 are examples of agricultural tractors.
Reference numeral 1 denotes an engine configured in the body 2 of the tractor, and a □transition case configured at the rear of the 3V-i engine 1. A hydraulic device 4 is mounted on the rear upper part of the case 3, and a lift is provided with a pair of left and right. A rear tilling rotary device (not shown) is raised and lowered by arm 5.5.

In the device 4, 6 is a control valve equipped with a spool 7, and the spool 7 responds to an external lever operation.
guides oil from a pump (not shown) into the hydraulic cylinder 10 through the suction/discharge oil passage 9 in the nozzle 8 as shown by arrow A in FIG. The swing arm 14 is rotated via the arm shaft 15, and the lift arm 5 is thereby raised via the arm shaft 15.

On the other hand, if the lever moves the spool 7 in the reverse direction, the cylinder 1
The oil in 0 is subjected to the load of the tilling rotary on the piston 11, and returns to the control pulp 6 as shown by arrow B. At this time, the oil is returned to the control pulp 6 as shown by the arrow B. The descending speed of the lift arm 5 can be controlled.

Here, 17 is a pulp side outlet opened in the control pal flow itself to communicate with the return oil path 9 as shown by the broken line arrow C in Figure 2, and the outlet 17 has no attached pipes and is directly connected to the return oil path 9. It is open.

Reference numeral 18 denotes an oil guide pipe, and the pipe 18 includes an X-axis introduction cylinder part 19 that fits inside the pulp side outlet 17 and can move forward and backward, and a Y-axis that communicates with and perpendicularly intersects the cylinder part 19. A relatively elongated intermediate cylindrical portion 20 curved in the direction, and an elongated nozzle 21 that is connected to the intermediate cylindrical portion 20 and curved in the Z-axis direction perpendicular thereto and oriented toward the pivot axis 13. Moving tube part 2
2, and normally a fulcrum plate 25 with an elongated hole 24 protruding from the swing cylinder portion 22 is opposed to a stay 23 protruding inside the housing 8 of the hydraulic device 4, as shown by solid lines in FIGS. 3 and 4. When the return spring 27 wound around the pin 26 protruding from the stay 23 presses against the fulcrum plate 25, the midway discharge port 28, which has the tip of the introduction cylinder 19 cut on both sides (45 degrees), becomes a pulp side outlet. It is completely stored within 17 days,
When overpressure from the cylinder 10 side acts here, the entire oil guide pipe 18 swings in the direction of arrow R about the fulcrum P, and balances with the spring 27 on a virtual line.

As a result, the mid-way discharge port 28 also slides in the removal direction from the pulp side outlet 17, and pops out from inside the outlet 17 as shown by the arrow E.
Excess oil is dropped directly into the bottom of the transmission case 3 as shown in the figure.

At this time, the sharp tip of the introduction cylinder 19 is connected to the valve side outlet 17.
The guide is used to ensure that the body remains in the body and dies, and when it returns, it is properly delivered by the guide.

Therefore, the back pressure in the oil passage 9 and the cylinder 10 is controlled to be reduced to the normal pressure due to the escape of the oil, and the lift arm 5 and the working machine descend at a constant speed without any hindrance.

The above-mentioned intermediate discharge port 28 is different from the above example by 9 as shown in Figure 5.
It may be formed in a cut state with a phase shift of 0 degrees, and in this case, because the pipe 18 is of a swing type, the cut end surface of the introduction cylinder 19 can smoothly advance and retreat without interfering with the pulp side outlet 17. and will be in compliance upon return.

This idea involves fitting the introduction cylinder of the oil guide pipe into the exhaust oil outlet so that it can slide freely in the insertion and removal direction, and when the amount of discharged oil increases, the introduction cylinder slides in the removal direction and removes excess oil from the introduction pipe. Since a spring is provided that elastically holds the introduction cylinder against the fixed side so that the discharge is discharged from between the part and the outlet, back pressure is not applied to the hydraulic cylinder side, and the hydraulic cylinder is always smoothly operated. Moreover, oil can be supplied to one lubricating point from the oil guide pipe at an appropriate injection pressure.

Incidentally, the midway discharge port 28 may be formed into a vertical slit shape as shown in the sixth illustrated example.

[Brief explanation of drawings]

Fig. 1 is an overall view of the tractor showing the arrangement of the hydraulic system of this invention, Fig. 2 is an enlarged sectional view of the hydraulic system, Fig. 3 is an enlarged view as seen from the arrow in Fig. 3, and Fig. 4 is an FIG. 5 is an explanatory diagram showing another specific example of the mid-way discharge port, and FIG. 6 is an explanatory diagram showing a modified example in which the mid-way discharge port is shaped like a vertical slit. 2... Airframe, 3... Mission case, 4... Hydraulic system, 6... Control valve, 18... Oil guide pipe, 27...
...-Return spring, 28... Midway discharge port, P... Swing fulcrum.

Claims (1)

[Scope of utility model registration request] In a lubricating system, an oil guide pipe is installed on the fixed side so as to face a desired lubrication point, and the oil guide pipe supplies discharged oil from a hydraulic cylinder to the desired lubrication point for lubrication. The introduction cylinder part is slidably fitted into the discharge oil outlet in the insertion/removal direction, and when the discharged oil increases, the introduction cylinder part slides in the extraction direction to remove excess oil between the introduction cylinder part and the discharge outlet. A lubricating device characterized in that a spring is provided to elastically hold the introduction cylinder portion to a fixed side so that the lubricating device is discharged from the lubrication device.